In fiber optic communication SMF refers to
Single-mode fiber (SMF) is an optical fiber that allows the transmission of a single mode of light, typically with a core diameter of 9 microns. MMF vs SMF: Multimode fiber (MMF) is typically used for short-distance, cost-efficient connections inside data centers and buildings, while single-mode fiber (SMF) is designed for long-distance, high-bandwidth transmission across campuses, metro links, and telecom networks. Choosing the right one depends on how far your data needs to travel, how much speed you need, and your project budget.
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